Alert archive / Colorado / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 13, NWS Denver/Boulder, CO

May 3, 2020Logan County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 3, 2020, 11:11 PM MDT for Logan County, Colorado. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 3, 2020, 11:11 PM MDT (05:11 UTC)
Expired
May 3, 2020, 11:39 PM MDT
In force
28 min
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Logan County, CO

The radar

The Goodland radar (KGLD), 173 km from the middle of the area, began a volume at 05:10 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 5.2 hours before the alert went out and 97 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2020-05-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 607 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2020-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
607 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
2079 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
291 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.6

Open this sounding in Storm Lab

The text

As transmitted.

410 
WUUS55 KBOU 040511
SVRBOU
COC075-040600-
/O.NEW.KBOU.SV.W.0013.200504T0511Z-200504T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Denver CO
1111 PM MDT Sun May 3 2020

The National Weather Service in Denver Colorado has issued a

* Severe Thunderstorm Warning for...
  Southeastern Logan County in northeastern Colorado...

* Until midnight MDT.

* At 1110 PM MDT, a severe thunderstorm was located 10 miles west of
  St Petersburg, or 10 miles east of Sterling, moving east at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees. Hail damage to 
           vehicles is expected.

* Locations impacted include...
  Southeastern Sterling, Fleming, Iliff, St Petersburg and Proctor. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4082 10265 4071 10265 4070 10267 4044 10266
      4044 10315 4082 10316
TIME...MOT...LOC 0510Z 268DEG 29KT 4059 10300 

HAIL...1.00IN
WIND...60MPH
 
$$

RPK
2 follow-up statements
042 
WWUS55 KBOU 040528
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
1128 PM MDT Sun May 3 2020

COC075-040600-
/O.CON.KBOU.SV.W.0013.000000T0000Z-200504T0600Z/
Logan CO-
1128 PM MDT Sun May 3 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT
FOR SOUTHEASTERN LOGAN COUNTY...

At 1128 PM MDT, a severe thunderstorm was located near St Petersburg,
or 20 miles east of Sterling, moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees. Hail damage to 
         vehicles is expected.

Locations impacted include...
Fleming, Proctor and St Petersburg. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4082 10265 4071 10265 4070 10267 4044 10266
      4044 10303 4082 10306
TIME...MOT...LOC 0528Z 268DEG 29KT 4060 10280 

HAIL...1.00IN
WIND...60MPH
 
$$

RPK
809 
WWUS55 KBOU 040539
SVSBOU

Severe Weather Statement
National Weather Service Denver CO
1139 PM MDT Sun May 3 2020

COC075-040549-
/O.CAN.KBOU.SV.W.0013.000000T0000Z-200504T0600Z/
Logan CO-
1139 PM MDT Sun May 3 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LOGAN COUNTY IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail, gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 4082 10265 4071 10265 4070 10267 4044 10266
      4044 10303 4082 10306
TIME...MOT...LOC 0539Z 268DEG 29KT 4060 10268 

$$

RPK

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 3, 6:43 PM MDTSevere Thunderstorm WarningBOUPhillips, Sedgwick47 min
May 3, 7:10 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln50 min
May 3, 7:42 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln48 min
May 3, 7:47 PM MDTSevere Thunderstorm WarningBOUMorgan43 min
May 3, 8:05 PM MDTSevere Thunderstorm WarningBOUWashington25 min
May 3, 8:30 PM MDTSevere Thunderstorm WarningBOUWashington45 min
May 3, 8:32 PM MDTSevere Thunderstorm WarningBOULincoln43 min
May 3, 8:51 PM MDTSevere Thunderstorm WarningBOUElbert39 min
May 3, 9:46 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln29 min
May 3, 10:19 PM MDTSpecial Weather StatementBOUWeld41 min
May 3, 10:37 PM MDTSevere Thunderstorm WarningBOUElbert26 min
May 3, 10:38 PM MDTSevere Thunderstorm WarningBOULogan38 min
May 3, 11:14 PM MDTSevere Thunderstorm WarningBOUElbert31 min
May 3, 11:18 PM MDTSevere Thunderstorm WarningBOULogan, Morgan, Washington, Weld42 min
May 3, 11:42 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert33 min
May 3, 11:48 PM MDTSevere Thunderstorm WarningBOULogan, Washington27 min
May 3, 11:50 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan25 min
May 4, 12:12 AM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Washington32 min
May 4, 12:28 AM MDTSevere Thunderstorm WarningBOUWashington32 min
May 4, 2:47 PM MDTFrost AdvisoryBOULarimer, Logan, Morgan, Weld17 hr

Nearby

Severe Thunderstorm Warnings in Colorado, 2020Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.