Alert archive / Missouri / Excessive Heat Watches in 2011
Excessive Heat Watch 3, NWS St. Louis, MO
NWS St. Louis, MO issued this excessive heat watch at Jul 29, 2011, 3:00 AM CDT for 8 counties in Missouri; 6 counties in Illinois. It took effect at Jul 31, 2011, 12:00 PM CDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Jul 29, 2011, 3:00 AM CDT (08:00 UTC)
- In effect from
- Jul 31, 2011, 12:00 PM CDT
- Expired
- Jul 30, 2011, 4:01 PM CDT
- In force
- Issued by
- NWS St. Louis, MO
Counties Adams County, IL, Brown County, IL, Greene County, IL, Macoupin County, IL, Montgomery County, IL, Pike County, IL, Audrain County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Monroe County, MO, Pike County, MO, Ralls County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 113 km from the middle of the area, began a volume at 08:01 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
Lincoln, IL (KILX), launched 00:00Z, 8.0 hours before the alert went out and 229 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.
- Mixed-layer CAPE
- 2796 J/kg
- Mixed-layer CIN
- -63 J/kg
- Mixed-layer LCL
- 1367 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 4.3
What forecasters said that day
The local office's own words before this excessive heat watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS St. Louis, MO wrote its last area forecast discussion before this excessive heat watch went out at Jul 29, 12:16 AM CDT, 2 hours 44 minutes earlier.
Area forecast discussion, Jul 29, 12:16 AM CDT, 2 hours 44 minutes before
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</html>Hazardous weather outlook, Jul 28, 7:14 PM CDT, 7 hours 46 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 714 PM CDT THU JUL 28 2011 ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-291130- GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL- MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL- CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX MO- LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO- AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO- LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO- ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO- WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO- MADISON MO-REYNOLDS MO- 714 PM CDT THU JUL 28 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS. .DAY ONE...TONIGHT EXCESSIVE HEAT WARNINGS AND ADVISORIES CONTINUE FOR CENTRAL AND SOUTHEAST MISSOURI AS WELL AS SOUTHWEST ILLINOIS. LITTLE RELIEF IS EXPECTED TONIGHT WITH HEAT INDEX READINGS FALLING ONLY INTO THE UPPER 70S TO LOWER 80S BY DAYBREAK. THE WORST CONDITIONS CAN BE EXPECTED ACROSS THE ST. LOUIS METROPOLITAN AREA. THERE IS A CHANCE OF THUNDERSTORMS ACROSS PORTIONS OF NORTHEAST AND CENTRAL MISSOURI AS WELL AS WEST CENTRAL ILLINOIS. A FEW STORMS COULD BE STRONG WITH WIND GUSTS TO 50 MPH AND HAIL. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THE DANGEROUS COMBINATION OF HEAT AND HUMIDITY WILL CONTINUE FRIDAY FOR AREAS ALONG AND SOUTH OF INTERSTATE 70...WHERE HEAT WARNINGS AND ADVISORIES ARE IN EFFECT AND PEAK HEAT INDEX READINGS WILL RANGE FROM 100 TO 110. AFTER SLIGHTLY COOLER CONDITIONS ON SATURDAY...THE DANGEROUS COMBINATION OF HEAT AND HUMIDITY IS EXPECTED TO RETURN SUNDAY AND CONTINUE INTO NEXT WEEK. PEAK AFTERNOON AND EVENING HEAT INDEX READINGS WILL RANGE FROM 100 TO 110 DEGREES. THUNDERSTORM CHANCES WILL INCREASE ACROSS NORTHEAST MISSOURI AND WEST CENTRAL ILLINOIS FRIDAY MORNING...THEN EXPAND SOUTHWARD FRIDAY AFTERNOON AND SATURDAY. A FEW STORMS MAY BE STRONG... MAINLY DURING THE AFTERNOON AND EVENING HOURS...WITH WIND GUSTS UP TO 50 MPH AND HAIL POSSIBLE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT. GKS
In the hours before
Special weather statement, Jul 28, 10:20 PM CDT, 4 hours 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1020 PM CDT THU JUL 28 2011 MOZ019-026-027-290400- LEWIS MO-MARION MO-SHELBY MO- 1020 PM CDT THU JUL 28 2011 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN SHELBY...MARION AND SOUTHERN LEWIS COUNTIES UNTIL 1100 PM CDT... AT 1017 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR EMDEN...OR 12 MILES NORTH OF MONROE CITY...MOVING NORTHEAST AT 15 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... PALMYRA... STEFFENVILLE... PHILADELPHIA... EWING... MAYWOOD... TAYLOR... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. GKS
Special weather statement, Jul 28, 11:10 PM CDT, 3 hours 50 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 1110 PM CDT THU JUL 28 2011 ILZ095-MOZ019-290500- ADAMS IL-LEWIS MO- 1110 PM CDT THU JUL 28 2011 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN LEWIS AND NORTHERN ADAMS COUNTIES UNTIL MIDNIGHT CDT... AT 1108 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 5 MILES EAST OF CANTON...MOVING EAST AT 20 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MENDON... GOLDEN... CAMP POINT... CLAYTON... URSA... LIMA... FOWLER... PALOMA... LORAINE... COATSBURG... WOODVILLE... CHATTON... LA PRAIRIE... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. GKS
Special weather statement, Jul 28, 11:50 PM CDT, 3 hours 10 minutes before
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</html>Special weather statement, Jul 29, 12:03 AM CDT, 2 hours 57 minutes before
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</html>The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 9:26 PM CDT | River Flood Warning | LSX | Perry, Sainte Genevieve | 10 days |
| Jul 28, 10:51 PM CDT | Severe Thunderstorm Warning | LSX | Lewis, Marion, Shelby | 39 min |
| Jul 28, 11:14 PM CDT | Severe Thunderstorm Warning | LSX | Lewis | 33 min |
| Jul 29, 2:48 AM CDT | Severe Thunderstorm Warning | LSX | Knox | 42 min |
| Jul 29, 5:55 PM CDT | Severe Thunderstorm Warning | LSX | Iron, Reynolds | 35 min |
| Jul 29, 5:56 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Madison, Montgomery | 49 min |
| Jul 29, 6:39 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 51 min |
Nearby
Excessive Heat Watches in Missouri, 2011Excessive Heat Watches in Illinois, 2011Every excessive heat watch in 2011
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.