• SPC Severe Thunderstorm Watch 261 Status Reports
    on June 6, 2020 at 7:28 pm

    WW 0261 Status Updates STATUS REPORT ON WW 261 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 W BAF TO 5 SSE CON TO 20 ESE MWN TO 25 E BML. ..MOSIER..06/06/20 ATTN...WFO...BOX...GYX... STATUS REPORT FOR WS 261 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS CTC003-013-015-062040- CT . CONNECTICUT COUNTIES INCLUDED ARE HARTFORD TOLLAND WINDHAM MEC001-005-011-013-015-017-023-031-062040- ME . MAINE COUNTIES INCLUDED ARE ANDROSCOGGIN CUMBERLAND KENNEBEC KNOX LINCOLN OXFORD SAGADAHOC YORK MAC005-009-013-015-017-021-023-025-027-062040- MA . MASSACHUSETTS COUNTIES INCLUDED ARE BRISTOL ESSEX HAMPDEN HAMPSHIRE MIDDLESEX NORFOLK Read more

  • SPC MD 855
    on June 6, 2020 at 7:25 pm

    MD 0855 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR WEST-CENTRAL INTO SOUTHERN FL Mesoscale Discussion 0855 NWS Storm Prediction Center Norman OK 0224 PM CDT Sat Jun 06 2020 Areas affected...West-Central into Southern FL Concerning...Severe potential...Watch unlikely Valid 061924Z - 062100Z Probability of Watch Issuance...20 percent SUMMARY...Isolated damaging wind gusts and/or a brief tornado or two remain possible from west-central into southern FL. DISCUSSION...A cluster of thunderstorms, at least one of which appears to be a supercell, recently developed over Hendry County before moving northward/north-northeastward towards southern Glades County and Lake Okeechobee. These storms appeared to initiate in an area of slightly warmer temperatures and surface confluence. This confluence band appears to arc northwestward off the west-central FL coast near SRQ before then continuing northwestward. Shallow rotating showers have been noted within this band just west of Tampa Bay, with lightning now beginning with one of these storms. Recent TBW VAD profiles continue to show vertically veering winds and strong low-level shear. Most recent observation sampled 0-1 km bulk shear over 35 kt and 0-1 storm-relative helicity near 280 m2/s2. Low-level winds weaken with southeastward extent, evidenced by weaker low-level shear from the AMX VAD. Overall expectation remains the same as described earlier, with a few storms occasionally becoming strong enough to produce a damaging wind gust or brief tornado. ..Mosier/Thompson.. 06/06/2020 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...MFL...TBW... LAT...LON 27308278 27908332 28248288 27948201 27568150 26898093 26328068 25688075 25468112 25748180 26508226 27308278 Read more

  • SPC Severe Thunderstorm Watch 262 Status Reports
    on June 6, 2020 at 7:22 pm

    WW 0262 Status Updates STATUS REPORT ON WW 262 THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..LYONS..06/06/20 ATTN...WFO...BOU...PUB... STATUS REPORT FOR WS 262 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC001-003-005-013-014-015-019-021-023-025-027-031-035-039-041- 043-047-049-055-057-059-065-069-071-073-075-079-087-089-093-101- 105-109-117-119-121-123-062040- CO . COLORADO COUNTIES INCLUDED ARE ADAMS ALAMOSA ARAPAHOE BOULDER BROOMFIELD CHAFFEE CLEAR CREEK CONEJOS COSTILLA CROWLEY CUSTER DENVER DOUGLAS ELBERT EL PASO FREMONT GILPIN GRAND HUERFANO JACKSON JEFFERSON LAKE LARIMER LAS ANIMAS LINCOLN LOGAN MINERAL MORGAN OTERO PARK PUEBLO RIO GRANDE SAGUACHE SUMMIT TELLER WASHINGTON WELD THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

  • SPC Severe Thunderstorm Watch 262
    on June 6, 2020 at 7:22 pm

    WW 262 SEVERE TSTM CO 061815Z - 070200Z URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 262 NWS Storm Prediction Center Norman OK 1215 PM MDT Sat Jun 6 2020 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Central and eastern Colorado * Effective this Saturday afternoon and evening from 1215 PM until 800 PM MDT. * Primary threats include... Scattered damaging winds and isolated significant gusts to 80 mph likely Isolated large hail events to 1.5 inches in diameter possible SUMMARY...High-based thunderstorms are developing just east of the Front Range in southeast Colorado, and additional development northward is expected through the afternoon. A separate broken band of severe storms in western Colorado will likely affect the higher mountain areas of central Colorado this afternoon. The storm environment across central Colorado will favor a mix of fast-moving supercells and bowing segments, while high-based storm clusters are expected farther east. The storm environment favors damaging winds as a primary threat, some of which could be significant, as well as isolated large hail. The severe thunderstorm watch area is approximately along and 85 statute miles east and west of a line from 40 miles north northeast of Fort Collins CO to 45 miles west southwest of Trinidad CO. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU2). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 260...WW 261... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 70 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 21045. ...Thompson Read more

  • SPC Severe Thunderstorm Watch 263 Status Reports
    on June 6, 2020 at 7:21 pm

    WW 0263 Status Updates STATUS FOR WATCH 0263 HAS NOT BEEN ISSUED YET Read more

  • SPC Severe Thunderstorm Watch 263
    on June 6, 2020 at 7:21 pm

    WW 263 SEVERE TSTM NE WY 061920Z - 070200Z URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 263 NWS Storm Prediction Center Norman OK 120 PM MDT Sat Jun 6 2020 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of The western Nebraska Panhandle Southern and eastern Wyoming * Effective this Saturday afternoon and evening from 120 PM until 800 PM MDT. * Primary threats include... Scattered damaging winds and isolated significant gusts to 75 mph likely Scattered large hail events to 1.5 inches in diameter possible SUMMARY...A band of severe storms, with a history of damaging winds in Colorado, will continue moving quickly north-northeastward into Wyoming through the afternoon. The storm environment across Wyoming and the Nebraska Panhandle appears favorable for a continued damaging wind threat. Isolated large hail may also accompany the strongest storms. The severe thunderstorm watch area is approximately along and 100 statute miles east and west of a line from 45 miles north of Gillette WY to 25 miles south of Laramie WY. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU3). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 260...WW 261...WW 262... AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 21045. ...Thompson Read more

  • SPC Severe Thunderstorm Watch 260 Status Reports
    on June 6, 2020 at 7:19 pm

    WW 0260 Status Updates STATUS REPORT ON WW 260 SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 ESE DRO TO 50 NNE DRO TO 30 NE MTJ TO 35 ENE GJT TO 25 N GJT TO 35 NE CNY TO 20 WSW CNY TO 25 NW U28 TO 45 W RKS. ..LYONS..06/06/20 ATTN...WFO...GJT...SLC... STATUS REPORT FOR WS 260 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS COC007-037-045-051-053-081-097-103-107-062040- CO . COLORADO COUNTIES INCLUDED ARE ARCHULETA EAGLE GARFIELD GUNNISON HINSDALE MOFFAT PITKIN RIO BLANCO ROUTT UTC009-019-047-062040- UT . UTAH COUNTIES INCLUDED ARE DAGGETT GRAND UINTAH THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. Read more

  • SPC Severe Thunderstorm Watch 260
    on June 6, 2020 at 7:19 pm

    WW 260 SEVERE TSTM CO UT WY 061550Z - 062300Z URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 260 NWS Storm Prediction Center Norman OK 950 AM MDT Sat Jun 6 2020 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Western Colorado Eastern Utah Extreme southwestern Wyoming * Effective this Saturday morning and afternoon from 950 AM until 500 PM MDT. * Primary threats include... Scattered damaging winds likely with isolated significant gusts to 75 mph possible Isolated large hail events to 1.5 inches in diameter possible A tornado or two possible SUMMARY...Thunderstorms will increase in coverage and intensity from late morning through the afternoon while spreading north-northeastward across eastern Utah and western Colorado. The storm environment will favor a mix of both supercells and bowing line segments capable of producing damaging winds and large hail. An isolated tornado cannot be ruled out. The severe thunderstorm watch area is approximately along and 125 statute miles east and west of a line from 55 miles northeast of Vernal UT to 25 miles southwest of Cortez CO. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU0). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && AVIATION...A few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 21050. ...Thompson Read more

  • SPC Day 2 Fire Weather Outlook
    on June 6, 2020 at 7:05 pm

    SPC Day 2 Fire Weather Outlook Day 2 Fire Weather Outlook NWS Storm Prediction Center Norman OK 0203 PM CDT Sat Jun 06 2020 Valid 071200Z - 081200Z ...EXTREMELY CRITICAL FIRE WEATHER AREA FOR FAR NORTHEAST NEW MEXICO INTO EASTERN COLORADO... ...CRITICAL FIRE WEATHER AREA FOR MUCH OF THE SOUTHWEST INTO THE CENTRAL HIGH PLAINS... Expanded the elevated and critical areas, especially on the western edge, to account for the latest high resolution forecast guidance. However, the main change to this forecast was the addition of an extremely critical area from far northeast New Mexico into eastern Colorado. Sustained winds are expected to be around 30 to 35 mph in eastern Colorado with relative humidity around 7 to 13 percent. While these borderline conditions may not typically warrant an extremely critical area, extreme drought, and very dry fuels are present across the area. Dry lightning has ignited numerous fires across the area in the last few days and widespread lightning is expected once again today in at least portions of the area where extremely critical conditions are expected tomorrow. Therefore, the risk for existing fires or holdovers in and near the area with the driest and windiest conditions expected tomorrow was the primary factor for the upgrade to an extremely critical delineation. ..Bentley.. 06/06/2020 .PREV DISCUSSION... /ISSUED 0224 AM CDT Sat Jun 06 2020/ ...Synopsis... Upper-level troughing over the West will strengthen as a shortwave trough moves into the Pacific Northwest and northern Rockies tomorrow. A belt of 50-65+ mph mid-level flow will stretch through the Intermountain West with downslope lee troughing across the High Plains. A cold front will push southeast through much of the Great Basin and into the Southwest and Rockies. ...Four Corners and High Plains... Drier air will filter into the Southwest and High Plains tomorrow with strong west-southwest winds developing from northern Arizona across northern New Mexico and northward through eastern Colorado. Sustained winds of 20-35 mph and minimum RH of 5-15% will result in critical conditions tomorrow and possibly beginning during late morning and lasting into the evening. Locally extremely critical conditions are likely with northern Arizona and portions of northeast New Mexico and eastern Colorado currently favored. Elevated/critical conditions may extend farther north across eastern Utah/western Colorado, however, rainfall is forecast today across the area. The eastern/northern extent of the elevated/critical conditions on the High Plains is somewhat uncertain given recent/forecast rainfall and how far east the lee trough will be located. However, confidence is high that elevated/critical winds/RH will develop over eastern Colorado and into portions of western Nebraska and far western Kansas. Elevated to locally critical conditions are expected to develop ahead of the cold front in central/eastern/southern Nevada and into southern/central Utah tomorrow. Holdovers remain a concern across this area and much of the outlook area given the recent/forecast lighting. ...Please see www.spc.noaa.gov/fire for graphic product... Read more

  • SPC MD 854
    on June 6, 2020 at 6:28 pm

    MD 0854 CONCERNING SEVERE POTENTIAL...WATCH LIKELY FOR CENTRAL AND EASTERN WYOMING...INTO FAR WESTERN NEBRASKA...AND SOUTH DAKOTA. Mesoscale Discussion 0854 NWS Storm Prediction Center Norman OK 0127 PM CDT Sat Jun 06 2020 Areas affected...central and eastern Wyoming...into far western Nebraska...and South Dakota. Concerning...Severe potential...Watch likely Valid 061827Z - 062000Z Probability of Watch Issuance...95 percent SUMMARY...A broken squall line is evolving across western and Central Colorado early this afternoon. Storms are expected to continue northeastward with additional development possible ahead of the line. Strong wind gusts (some significant) will be possible. A downstream Severe Thunderstorm Watch is likely. DISCUSSION...18z mesoanalysis placed a negatively tilted shortwave trough and 80 kt 500 mb speed max across the Four Corners. The wave is expected to shift rapidly northeastward over the next few hours. Strong ascent and some clearing ahead of the main wave is expected to continue to destabilize the lower atmosphere with 250-500 J/kg of MLCAPE ahead of the ongoing storms. Some hi-res guidance also shows the possibility of additional storm development across central and eastern Wyoming. This seems reasonable given warm/moist surface conditions with dewpoints in the 40s/50s F and persistent southeast upslope flow. Given the strong wind profiles with effective shear of 50-70 kt, a mix of supercells and bowing segments with severe wind gusts (possibly significant) are expected, given the report history of the ongoing storms and the continued strong mid-level flow. The strong shear and possible supercell mode may support some isolated hail and tornado cannot be ruled out. A watch is likely by 20z ..Lyons/Thompson.. 06/06/2020 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...UNR...CYS...BYZ...RIW... LAT...LON 41040876 41050431 41230388 41510387 44980401 44970654 44850680 44630711 41240897 41040876 Read more